I make this a lot, since long before I saw this recipe. It's a pretty standard Italian approach.
BUT be forewarned that broccolini and broccoli rabe (rapini) are not one and the same as the recipe infers.

I served this dish on Christmas Eve to complement duck with braised red cabbage and prunes and wild rice stuffing with dried fruit. It was a simple, tasty vegetable dish that offered a slightly bitter, spicy contrast to the sweetness of the other dishes. Delicious and healthy to boot!

this was really good. i suspect it would be even better had i used all the ingredients listed. i omitted the pepper flakes because of my children, and in a flash i had used beef broth instead of chicken (i had 3 couses going already, one of which was the main entree...a beef dish... and so there was already an open can of beef broth just calling my name).